284 THE SEA-WEEDS AT HOME AND ABROAD. 
other kinds. Sometimes they are served up with lemon 
juice under the name of Oystergreen, and as a diet are con- 
sidered of good repute. The broadest leafed kind are se- 
lected. The green particles which correspond to the seeds 
are deeply embedded in the pulp of the entire plant, and 
commonly arranged in fours, while those of the Purple laver 
(Porphyra), which notwithstanding their color, so distinct 
from the seeds of the Chlorosperms, form an exception to the 
general rule, and though possessing rounded granules, qua- 
ternally arranged, are also provided with clusters of oval 
seeds (fig. 73) besides thus indicating a step 
forward in the progressive development. To 
QR find this pretty alga it is well to examine the 
b piles and timbers of wharves, and the perpen- 
QD ` dicular faces of rocks submerged by the tides. 
Other and finer species than our own have a 
wide dispersion, and in common with the green 
lavers may be frequently met with, abroad, in similar situa- 
tions. Not very unlike their cousins, the Ulve, are the 
grotesque looking, pale green, inflated bullate Enteromor- 
phas, tossed in wild confusion, and mingled irrespectively 
together, with the usual rejectamenta of the sea upon the 
rocks; despised and overlooked as they are apt to be there 
they are respectable Chlorosperms when growing and thriv-- 
ing under the water; and a little care and attention to their 
merits will give them their place among the dried trophies 
of the ocean gleanings. Singularly alike, and yet different, 
are the Tetrasporas of the fresh-water, floating quietly upon 
the stream, their lax netted tissues of pleasant green color 
having their interior substance dotted over with clusters of 
seeds arranged in fours; and others of humbler pretensions 
but of wondrous symmetry and beauty nestling like small 
disks upon the pebble or upon the submerged log, or throw- 
ing wide upon the current their elegant beaded filaments like 
necklaces of strung jewels, embraced by the Chlorosperms 
or claimed by aberrant forms of the Confervze. ; 
Seeds of Porphyra. 
